The Sankenbachsee is a tarn southwest of Baiersbronn in the Black Forest in southwestern Germany. The Sankenbach stream flows through the lake. In the 1980s a low weir was built at the outflow of the Sankenbach which protects the lake from silting up.
Sankenbachsee is a cirque lake (Karsee) formed during the last Ice Age, created by glacial erosion. It lies in a steep, bowl-shaped valley typical of glacial landscapes in the Black Forest.
The nearby Sankenbach Waterfalls feed the lake and are a popular hiking destination. This makes the area a combined lake, waterfall ecosystem, which is relatively uncommon in compact Alpine-style terrain.